Mutations that result in resistance to specific antibiotics in bacterial organisms occur
A. only when the bacteria are exposed to the drug to which they become resistant.
B. at any time, even when the bacteria are not exposed to the drug.
C. more often when the bacteria are exposed to the drug.
D. only when the bacteria are exposed to radiation or other mutagens.
Answer: B
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A food web is a more realistic depiction than a food chain because:a
organisms rarely eat just one kind of food. b. energy flow is linear. c. energy flow is cyclic. d. a more complex model is always better than a simple one. e. matter cycles in ecosystems.
If a cell has 46 chromosomes at the beginning of mitosis, then at the end of anaphase there would be a total of
a. 23 chromatids. b. 23 chromosomes c. 92 chromosomes d. 46 chromosomes
Cells that generate electrical impulses form ________ tissue
Fill in the blank(s) with correct word
All of the following are fuels produced by microorganisms EXCEPT
A) cellulose. B) ethanol. C) hydrogen. D) methane. E) oil from algae.